sun, worshipped by ancient civilizations,
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, wasn’t just a source of warmth, it also produced ingredients for life,” he says.
Life’s earliest traces date back to around 4.1 billion years ago (SN Online: 10/19/15). At the time, the sun was about 25 to 30 percent dimmer than it is today — too faint to keep Earth’s temperatures above freezing without the help of additional greenhouse gases (SN: 5/4/13, p. 30). Simulating the early sun using star data collected by NASA’s Kepler space telescope as a guide,
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, Airapetian and colleagues found that while dim,
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, the sun was probably wilder in its youth. Solar flares,
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, also called coronal mass ejections,
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, probably erupted more often and with more ferocity, producing storms 1,000 times as powerful as the most intense flares on record.
Those storms made a big impact on Earth, the researchers propose. The storms temporarily squeezed the magnetosphere,
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, the protective magnetic bubble surrounding Earth,
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, to one-sixth its normal height. That squashing allowed more solar particles to rain into the atmosphere. The dive-bombing particles ionized and broke apart nitrogen molecules in the air. Those molecules reassembled into new ones such as hydrogen cyanide, which can produce DNA bases and amino acids.
Another product, nitrous oxide,
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, is a greenhouse gas nearly 300 times as potent as carbon dioxide. The additional nitrous oxide

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